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peter took a 1,500 mile trip in 5 days. each day, he drove 30 miles more than the day before. how many miles did he cover on the first day?

  • math -

    You have an arithmetic series,
    where d = 30 , and Sum(5) = 1500 , a is first term
    sum(n) = (n/2)(2a + (n-1)d)
    1500 = (5/2)(2a + 120)
    600 = 2a+120
    2a=480
    a = 240
    On the first day he went 240 miles

    check: 240 + 270 + 300 + 330 + 360 = 1500

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